Limiting Domains users can log into

My company just recently established a two-way forest trust between 2 active directories domaina.abc.def and domainb.abcdef.def. I run a few labs and my users are becoming a bit confused. Is there a way I can limit the drop down box to showing only Domain A instead of both Domain A and Domain B??

If you've got a 2 way trust from the domain the users log in with through to the other domain, then that will always appear in the list. The only direct solution to actually remove the domain from the list is just to use a one-way trust from the other domain into the main users' domain - that way, the trusting domain will have both domains as a log on option, but the users' trusted domain won't

however , you might get round this by hiding the list all together and cause it to go to a default

HKLM\Software\Microsoft\WindowsNT\CurrentVersion\Winlogon.
The 2 keys to change are:
ShowLogonOptions - set to 0 to hide the domain list &
DefaultDomainList - set this to the domain you need to logon to

This is pretty much what I was looking for. I don't have the ability to change any of the domain settings and only have control over the individual machines. I can still log in as local or domain b by prefixing the name domainb/user etc. Thanks

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